Wait. If Zev & Justin do the Detour by a bus & Lance & Keri do the RB by a bus as well, what does it all mean?

Also, look at the bus behind Zev: It says "15T-8ON" & "Thanh Pho". Is this any hint as to where they are in that shot?

My first thought was Zev is watching Justin do the RB with the bus behind him?

Oh right. At first I thought it was at the Detour, but Justin was wearing black in the giraffe shot and at the bus shot, the guy behind Zev with the backpack is wearing a different color. Looks like one of Dan/Sam to me?

TEAMS STRUGGLE TO KEEP PACE IN THE HECTIC STREETS OF VIETNAM AND ONE TEAM RISKS THEIR OWN POSITION IN THE RACE BY OFFERING TO HELP THE COMPETITION, ON "THE AMAZING RACE 15," SUNDAY, OCT. 4 ON CBS "It's Like Being Dropped on Planet Mars (Vietnam)" - Teams struggle to combat the hectic pace of Vietnam and one Team puts their own Race in jeopardy by offering to help the competition, on THE AMAZING RACE 15, Sunday, Oct. 4 (8:00-9:00 PM, ET/PT) on the CBS Television Network. Phil Keoghan is the host.

TEAMS STRUGGLE TO KEEP PACE IN THE HECTIC STREETS OF VIETNAM AND ONE TEAM RISKS THEIR OWN POSITION IN THE RACE BY OFFERING TO HELP THE COMPETITION, ON "THE AMAZING RACE 15," SUNDAY, OCT. 4 ON CBS "It's Like Being Dropped on Planet Mars (Vietnam)" - Teams struggle to combat the hectic pace of Vietnam and one Team puts their own Race in jeopardy by offering to help the competition, on THE AMAZING RACE 15, Sunday, Oct. 4 (8:00-9:00 PM, ET/PT) on the CBS Television Network. Phil Keoghan is the host.

Right now, I can only see Maria/Tiffany and Sam/Dan helping each other and they wouldn't help each other during frantic race time, so I wonder who this could be.